Yellow disazo dye.



UNTTE STATES EN T ARTHUR ZART, OF VOHWINKEL, NEAR ELIBERF ELD, AND HUGO SCHWEITZER, OF ELBERFELD, GERMANY, ASSIGNORS T0 FAR-BENFABRIKEN VORM. FRIEDR. BAYER &.CO., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

I YELLOW DISAZO DYE.

N0 Drawing.

To all whom it may concern.

Be it known that we, ARTHUR ZART and.

acids of nitroaminoazo compounds in which 1 the nitroand amino groups are contained in dificrent nuclei or of the corresponding diaminoazo compounds in which one hydrogen of one amino group is replaced by an acid radical and in subsequently reducing the products obtained from" the nitroaminoazo compounds or in saponifying the products obtained from diaminoazo com- 1 pounds containing an acid radical. The urea compounds are produced in the usual way by treatment with phosgene. The new dyes are after being dried and pulverized in the shape of their alkaline salts. dark yellow powderssoluble in water with ayellow color and soluble in concentrated sulfuric acid with a reddish to violet color.

Upon reduction with stannous chlorid and is after solution in aqueous sodium carbonate converted 1nto the urea compound by it c con

Specification of Letters Patent.

Application filed April 25, 1911. Serial no. 623,177.

formic acid radical.

and filtered off. It is after being dried and pulverized in the shape of its sodium salt a treatment with phosgene, then salted out, filtered ofl' and boiled for 20 minutes with a 1 per cent caustic soda lye to eliminate the It is then salted out Patented Aug 8, 1 911.

dark yellow-powder soluble in water with a yellow color and soluble in concentrated sulfuric acid with a viole't color; yielding upon reduction with stannous chlorid and hydrochloric acid ineta-phenylene-diaminortho-sulfonic acid andthe urea of aminocresidin on; CH3

(iCH

methoxy ortho meta diamin'otoluene and carbonic acid. It dyes cotton yellow yielding a pure yellow of good fastness to washing after combination with diazotized paranitranilin. The shade thus produced can ,be well discharged. 1

Instead of formyl-meta-phenylenediamin sulfonic acid 6-nitro-2-aminotoluene-4-sulfonic acid, 4r-nitranilin-2-sulfonic acid,', 4:- nitranilin-3-sulfonic acid, formyl-2L6-diaminotoluene-t-sulfonic acid, formyl-QA-toluylenediamin 5 sulfonic acid, formyl paraphenylenediamin sulfonic acid:

NH.COH

I -SOlfi etc. can be employed.

As second component anyother suitable amin can be usede. g. anilln, t01u1d1ns,

Xylidins, acidyldiamins, naphthylamins','etc.

We claim 1. The herein described new dyestuifs being ureas of sulfonlc acids of aminoazo compounds -containing free amino groups,

which dyes are after being dried and pulverized in the shape of. their alkaline salts Y dark yellow powders soluble in water with a yellow and soluble in concentrated sulfuric acid with a reddish etc violet color; yielding upon reduction with stannous chlorid and hydrochloric acid a diamino sulfonic acid and a urea of a diamin, which is further decomposed into carbonic acid and a diamin; dyeing cotton yellow to orange shades which on being developed on. the fiber become fast to washing, substantially as described.

The herein described new dyestuff being the urea of the azo compound from nieta-phenylenediamin sulfonic acid and cresidin of the formula:

which is after being dried and pulverized in the shape of its sodium salt a dark yellow OCH;

powder soluble in water with a yellow color and soluble in concentrated sulfuric acid with a violet color; yielding upon reduction with stannous chlorid and hydrochloric acid meta-phenylenediamin sulfonic acid and the urea of amino-cresidin which is further decomposed into para-methoxy-ortho metadiamino-toluene and carbonic acid; dyeing cotton yellow shades fast to washing after combination with diazotized paIa-nitranilin, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

ARTHUR ZART.

HUGO SCHWEITZER. Witnesses:

CHAS. J. WRIGHT,

ALFRED HENKEL.

[1,. s.] [L. s]

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

